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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fad6e368f0fb8ea291cd2d436adaedbb1170fbcd8e9034e3e9411b96bd5770b0' 
  AND token = '1hX6gbuJECK4XEvJovTtU+yg+EM/qrbsDf9nPb3B4fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}